I have seen a lot of Kennen builds, but non to my full satisfaction. I have combined a few of them, and done some research on the items my self. This is what came out, hope you like it!

That is the great thing about Kennen. After 5 items, you are practically done. You have all you need, which are: (a lot of)Ability Power, Movement Speed, a bit of Spell Vamp, a great Slow and last but not least: you can indeed become an invulnerable Stasis for 2 seconds.

For choosing which item you will buy last, you must consider what is going wrong in the game:

- Do you die a lot?
- Are there (1 or more) people you seem to not be able to kill?
- Do I get stunned to much?

Then consider this when:
- you die a lot
How do you die?
-Physical Damage = Thornmail
-Magic Damage = Banshee`s Viel or Guardian Angel
-Both? = Warmog`s Armor or other health items + play more safe

- Are there (1 or more) people you seem to not be able to kill?
Why do they not die?
- Magic Resist - Void Staff
- To much health - Deathfire Grasp

- Do I get stunned to much?
Then buy:
- Quicksilver Sash

In mid, you can be great! You don`t have to die (because of all the escape capability`s Kennen has), you can farm from a distance and try to kill whenever the opportunity comes.
Thereby you can gank a great deal too. You Rush to bot or top, by the time you get there you have it all up again. Use all your spells to ensure maximum result!

But take care, when you miss your Shuriken it might be very, very fatal..
Not only the missing damage, but also because you don`t apply a mark. No mark, no stun, no triggering Electrical Surge - well, what I say: fatal..

And also understand: although your escape can be great, in team fights its hardly an option. Therefore take care when you go in. Use your Hourglass well, its needed.

Flash and Ignite are great on Kennen.

Flash is to get in with your ult, or to simply run away and escape. Together with Lightning Rush you are in or out without anybody noticed!

Ignite is great for helping you kill. And then I foremost mean the Health gaining reduction of 50%. Great for champs you would otherwise not be able to kill because of there ridiculous healthregeneration.

You want to be able to stun fast and clean. Therefore you need your Shuriken, Electrical Surge and your Lightning Rush. Upgrade them in this order right away.

Then, it comes to aiming. You must throw and hit your Shuriken at all times. Therefore upgrade as soon as possible at all times. There after your Electrical Surge is an easy hit. For it is, upgrade whenever you are not able to upgrade your Shuriken. Your ult must off course come at level 6, 11 and 16. That ends with Lightning Rush to be upgraded the last of all.

Farmin with Kennen is very, very easy. Simply rush in and trigger with Electrical Surge late game. That will waste a total minion wave. Early game you can always lasthit with your Shuriken. That to makes it important to upgrade the Shuriken when ever possible!

Think a good choice. Got this from a build (Kennen Hiiiyyahhhh by Hugenjpana) and could not see anything wrong it. Magic pen is very important, and Kennen can always use the health. Add that to the Ability Power and the discussion is over.

Same story. From a build (Kennen Hiiiyyahhhh by Hugenjpana). Good mastery`s for the ability power (the 4% can add up to over 25 Ability Power!) and for the defense 4% reduces damage income is very welcome.